There was an idea in the ballrace community to add the option to play all worlds in previous updates using steam depot, where there are fewer maps, different physics and sometimes different skips you could do (Midori 10 for example)

I have an idea to split all worlds into 4 categories. 0.1.0.0 + Midori, Memories, Nimbus, Paradise 0.1.6.0 + GLXY, Summit 0.3.6.0 + Prism, Khromidro, Oasis Current update

Any version from 0.7.0.0 has leaderboards, which can be abused to get high scores in ballrace ILs in past versions, so I'm not going to include runs in previous updates with Event Horizon or Woodlands.

However, I'm not sure what the devs would think about this, as I'm told they don't want people playing older versions of the game. Also, I think there are multiple updates where the game allows you to abuse stats, such as being able to exploit units.

Just a thought for now, I wont add these anytime soon.